<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div,p,strong {
            color: red;
        }
    </style>
</head>
<body>
    <div>
        div的内容会变红
    </div>
    <span>span的内容不会变红</span>
    <p>段落内容会变红</p>
    <strong>strong的内容会变红</strong>
</body>
</html>